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VCO jitter simulation noise type and where to choose the osc_version and noiseout when running pnoise

dog1

Hello all,

I am trying to simulate the jitter of a VCO. I tried to use "noise type"  as "jitter-FM", or "modulated", and it doesn't work. Here is the error:

ERROR (SPCRTRF-15405): 'noisetype=correlations' is not supported for 'osc_version=dts'. Try:
            (1) set 'osc_version=dts' and 'noiseout=[am pm]' to get AM/PM noise, or,
            (2) set 'osc_version=augmented' to get correlations results.
        'osc_version=augmented' is obsolete and 'osc_version=dts' is recommended.

I tried to include "noiseout=[0 1]' in the "additional parameters" under "option", but it is giving the same result.

In addition, should I be using PM or FM jitter, what are the difference?

Thanks.

BR

CHEN

  • Tawna

    Hi Chen,

    What version of MMSIM are you using?   This will be in the spectre.out simulation logfile. 

    What version of IC are you using?  This will be in the CDS.log logfile.

    How are you setting up your simulation?   A screenshot of your choosing analyses forms would help.

    Better yet... the options and analyses statements from your netlist.

    The Spectre RF User Guide in MMSIM 15.1 is a good place to start.  If you are using IC6.1.7 and MMSIM 15.1, there are a number of articles on http://support.cadence.com that show how to set  up a vco jitter measurement.

    best regards,

    Tawna

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